I agree that we should not try to limit God. I do have a question about your statement, though, that "it (salvation) took place some time after the person had come to the Lord". Would you agree that a person is not saved until his/her sins have been forgiven?
Sorry, bad use of a pronoun. By "it" I was referring to the Holy Spirit coming to the person in power (i.e. demonstrating His gifts), not salvation. To return to the example of Philip, those who believed from his testimony were saved then (if any died before the Apostles came, they're in heaven now), but they did not receive their gifts of the Spirit until the Apostles laid hands on them.